3. The mean time costumer waits in line before checking in a grocery chain is less than 10 minutes. To verify the performance of the store, the obtaining mean time of 25 costumers is 9.5 minutes with standard deviation of 1.6 minute. Use these data to test the null hypothesis that the mean time is 10 minutes, at 0.01 level of significance.
3. The mean time costumer waits in line before checking in a grocery chain
is less than 10 minutes. To verify the performance of the store, the
obtaining mean time of 25 costumers is 9.5 minutes with standard
deviation of 1.6 minute. Use these data to test the null hypothesis that
the mean time is 10 minutes, at 0.01 level of significance.
4. A fast food restaurant cashier claimed that the average amount spent by
the customers for dinner is ₱125.00. Over a month period, a sample of 50
customers was selected and it was found that the average amount spent
for dinner was ₱130.00. Using 0.05 level of significance, can it be
concluded that the average amount spent by customers is more than
₱125.00? Assume that the population standard deviation is ₱7.00.
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